CBSE Class 12 Science (PCB) (CBSE Class XII — Science Stream (Physics + Chemistry + Biology)) — Free Online Mock Test

CBSE Class 12 Science (PCB) exam at a glance

50 full-length mock tests

Attempt 50 full-length mocks

Each is a distinct question set built on the real 135-question, 240-minute pattern, with instant scoring and section-wise analysis. The first is free; unlock all 50 forever for $1.99 (one-time, no subscription).

CBSE Class 12 Science (PCB) section breakdown

The CBSE Class 12 Science (PCB) mock test on Wrexa Edge replicates the real exam's section structure — same names, same question count per section, same time limits. No inter-section breaks — the timer runs continuously.

• Physics (35 Q)
  35 questions · 60 minutes · ~103 sec/question
• Chemistry (35 Q)
  35 questions · 60 minutes · ~103 sec/question
• Biology (35 Q)
  35 questions · 60 minutes · ~103 sec/question
• English Core (30 Q)
  30 questions · 60 minutes · ~120 sec/question

Marking scheme

+1 per correct. Try your score.

Strategy: CBSE Class 12 Science (PCB) has no negative marking. Attempt every question — blank answers cost you potential marks but cannot pull your score down.

Scale: CBSE Class 12 PCB (out of 70 per paper).

How CBSE Class 12 Science (PCB) is conducted

• Mode
  Standard — practice without proctoring on Wrexa Edge, or enable optional webcam proctoring to simulate test-day conditions.
• Test format
  Linear / fixed-form — every candidate sees the same number of questions per section.
• Backtracking
  Allowed — you can revisit and change answers within a section.
• Mark for review
  Available — flag tough questions and return to them before submitting the section.

CBSE Class 12 Science (PCB) time strategy

With 135 questions in 240 minutes, you have about 107 seconds per question on average. Successful candidates aim for the following pacing on each section:

• Physics (35 Q)
  Target ~103 sec/question. If a question takes more than 155 seconds, mark for review and move on.
• Chemistry (35 Q)
  Target ~103 sec/question. If a question takes more than 155 seconds, mark for review and move on.
• Biology (35 Q)
  Target ~103 sec/question. If a question takes more than 155 seconds, mark for review and move on.
• English Core (30 Q)
  Target ~120 sec/question. If a question takes more than 180 seconds, mark for review and move on.

Wrexa Edge's analytics show your actual time-per-question after every mock so you can spot which sections you're losing time on.

CBSE Class 12 Science (PCB) topics covered

Across the 50 Wrexa Edge variants of CBSE Class 12 Science (PCB), the following topics appear most often (sample distribution from one variant):

Physics (35 Q)

• Physics — Energy · 5
• Physics — Circular Motion · 5
• Physics — Electricity · 5
• Physics — Waves · 5
• Physics — Mechanics · 5
• C12 Phy — Modern Phy · 2
• Physics — Electromagnetism · 2
• C12 Phy — Electrostatics · 1

Chemistry (35 Q)

• Chemistry — Fundamentals · 28
• C12 Chem — Organic · 3
• C12 Chem — Kinetics · 2
• C12 Chem — Biochem · 2

Biology (35 Q)

• Biology — Fundamentals · 25
• C12 Bio — Biotech · 2
• C12 Bio — Ecology · 2
• C12 Bio — Genetics · 2
• C12 Bio — Cell · 2
• C12 Bio — Plants · 1
• C12 Bio — Molecular · 1

English Core (30 Q)

• English Core — Grammar · 9
• English Core — Literature (Flamingo) · 7
• English Core — Reading · 6
• English Core — Literature (Vistas) · 5
• English Core — Writing · 3

CBSE Class 12 Science (PCB) difficulty calibration

Advanced tier. Advanced-level: high-stakes exam with rigorous content depth. Expect 4-8 months of structured prep.

CBSE Board · Class 12 PCB (medical aspirants) · Physics + Chemistry + Biology · 3h each · 70 theory + 30 practical. · Official language: English & Hindi.

Verified content — Wrexa Edge's CBSE Class 12 Science (PCB) bank has been deeply curated with real exam-aligned content (estimated 100% syllabus coverage).

How Wrexa Edge prepares you for CBSE Class 12 Science (PCB)

• Real test-day interface
  Our sat skin mirrors the actual CBSE Class 12 Science (PCB) testing software — same timer, palette, tools, and navigation.
• 50 distinct variants
  6750 unique practice questions, each variant a fresh test — not just shuffled options.
• Detailed analytics
  Scaled score, section accuracy, topic-wise heatmap, time-per-question — see where to focus after every attempt.
• Spaced repetition (Notebook)
  Wrong answers and flagged questions flow into an SM-2 spaced-repetition deck so you actually retain what you learn.
• Optional proctoring
  Browser-based face-api detection (no install) — turn it on to simulate a high-stakes environment.
• Free to start
  No credit card. Sign up, pick a variant, and your first CBSE Class 12 Science (PCB) mock starts in under a minute.

CBSE Class 12 Science (PCB) study plan

A phase-by-phase roadmap from your first concept to test-ready. Stretch or compress each phase to fit the time you have before your attempt.

Where CBSE Class 12 Science (PCB) can take you

A strong CBSE Class 12 Science (PCB) result opens up these careers and higher-study paths:

• College & university admission
  A strong score strengthens applications to top undergraduate programmes and competitive entrance exams.
• Scholarships & merit awards
  High performers qualify for merit scholarships, honours tracks and early-admission schemes.
• Foundation for competitive exams
  Builds the core concepts that later feed into engineering, medical, and civil-service entrance tests.

Sample CBSE Class 12 Science (PCB) practice questions

4 questions taken from the CBSE Class 12 Science (PCB) mock tests on Wrexa Edge. Try each one, then reveal the answer.

1. Biology (35 Q) · C12 Bio — Biotech

   Q1. PCR (Polymerase Chain Reaction) is used to:

   1. Sequence DNA directly
   2. Cut DNA at specific sites
   3. Translate to protein
   4. Amplify specific DNA segments via thermal cycling
   Show answer

   Answer: D — Amplify specific DNA segments via thermal cycling

2. Biology (35 Q) · C12 Bio — Ecology

   Q2. An ecosystem's "trophic level" represents:

   1. A position in the food chain (producer, primary consumer, secondary consumer, etc.)
   2. A type of soil
   3. A climate zone
   4. A geological era
   Show answer

   Answer: A — A position in the food chain (producer, primary consumer, secondary consumer, etc.)

3. Biology (35 Q) · C12 Bio — Ecology

   Q3. A "keystone species" is:

   1. The most numerous species
   2. A species disproportionately affecting its ecosystem (often a top predator)
   3. The smallest species
   4. A migratory species only
   Show answer

   Answer: B — A species disproportionately affecting its ecosystem (often a top predator)

4. Biology (35 Q) · C12 Bio — Genetics

   Q4. DNA is a:

   1. Single-stranded RNA
   2. A protein
   3. Double-stranded helix of nucleotides (A-T, G-C base pairing)
   4. A lipid
   Show answer

   Answer: C — Double-stranded helix of nucleotides (A-T, G-C base pairing)

Frequently asked questions

What is the CBSE Class 12 Science (PCB) exam pattern?

CBSE Class XII — Science Stream (Physics + Chemistry + Biology) contains 135 questions across 4 sections: Physics (35 Q), Chemistry (35 Q), Biology (35 Q), English Core (30 Q). Total duration is 240 minutes (about 107 seconds per question).

Does CBSE Class 12 Science (PCB) have negative marking?

No — CBSE Class 12 Science (PCB) has no negative marking. Each correct answer is worth 1 mark, so attempt every question.

How is CBSE Class 12 Science (PCB) scored?

Scaled score range: 0 to 70. CBSE Class 12 PCB (out of 70 per paper).

How can I practise CBSE Class 12 Science (PCB) online for free?

Wrexa Edge gives you a free full-length CBSE Class 12 Science (PCB) mock test — with instant scoring, detailed explanations and analytics — plus 49 more with a one-time $1.99 unlock that never expires. Start practising in under a minute, no card required.

What is the difficulty level of CBSE Class 12 Science (PCB)?

CBSE Class 12 Science (PCB) is rated Advanced difficulty on Wrexa Edge. Advanced-level: high-stakes exam with rigorous content depth. Expect 4-8 months of structured prep. CBSE Board · Class 12 PCB (medical aspirants) · Physics + Chemistry + Biology · 3h each · 70 theory + 30 practical. · Official language: English & Hindi.

How long is the CBSE Class 12 Science (PCB) exam?

CBSE Class 12 Science (PCB) runs for 240 minutes total across 4 sections. On Wrexa Edge the timer is enforced exactly as on the real exam — including no inter-section breaks.

What topics are covered in CBSE Class 12 Science (PCB)?

CBSE Class 12 Science (PCB) is split into: Physics (35 Q), Chemistry (35 Q), Biology (35 Q), English Core (30 Q). Each section is timed and weighted separately. CBSE Board · Class 12 PCB (medical aspirants) · Physics + Chemistry + Biology · 3h each · 70 theory + 30 practical. · Official language: English & Hindi.

What tools or aids are allowed during CBSE Class 12 Science (PCB)?

No special tools are required.

Is the CBSE Class 12 Science (PCB) test adaptive?

No — CBSE Class 12 Science (PCB) is a fixed-form (linear) test. Every candidate sees the same number of questions per section.

How many CBSE Class 12 Science (PCB) mock tests does Wrexa Edge offer?

Wrexa Edge generates 50 distinct CBSE Class 12 Science (PCB) variants — each with different question content, not just shuffled options — the first one free for everyone and 49 more with a one-time $1.99 unlock. That's 6750 unique practice questions in the real test-day interface.

Is there a free CBSE Class 12 Science (PCB) test series 2026?

Yes. The Wrexa Edge CBSE Class 12 Science (PCB) test series for 2026 gives you a free full-length mock test (50 in total) plus subject-wise and topic-wise tests — instant scoring and detailed analysis, no card required.

Are CBSE Class 12 Science (PCB) previous year question–style papers included?

Every CBSE Class 12 Science (PCB) mock is modelled on the official exam pattern and the style of previous years' papers — the same 135-question structure, sections and marking — so your practice mirrors the real paper you'll sit.

Which is the best free CBSE Class 12 Science (PCB) mock test online?

Wrexa Edge's CBSE Class 12 Science (PCB) mock test replicates the real exam interface, timing and marking scheme, with instant score, section-wise analysis and 50 fresh variants — a strong free choice for 2026 preparation.

Can I take the CBSE Class 12 Science (PCB) mock test on mobile?

Yes. CBSE Class 12 Science (PCB) mock tests run in any browser on mobile, tablet or desktop — no app or download needed. Start on your phone and your progress and analytics sync when you sign in.

What is the CBSE Class 12 Science (PCB) syllabus?

The CBSE Class 12 Science (PCB) syllabus maps to its 4 sections: Physics (35 Q), Chemistry (35 Q), Biology (35 Q), English Core (30 Q). Wrexa Edge's mock tests cover the complete syllabus topic by topic — see the topics-covered breakdown above — so you practise every area at real exam difficulty.

What is the eligibility for CBSE Class 12 Science (PCB)?

Eligibility for CBSE Class 12 Science (PCB) — age, qualification and number of attempts — is set by the official conducting body and can change each cycle, so always confirm the current official notification before applying. Wrexa Edge focuses on realistic CBSE Class 12 Science (PCB) practice: a free full-length mock in the exact exam pattern, ready whenever you are.

When is the CBSE Class 12 Science (PCB) exam and how should I prepare?

Official CBSE Class 12 Science (PCB) exam dates are announced by the conducting body for each cycle — check the latest notification for the current schedule. To be ready, follow a phased study plan and take full-length timed mocks; Wrexa Edge gives you a free CBSE Class 12 Science (PCB) mock with instant scoring so you can track your readiness week by week.

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